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Buktikan identitas trigonometri sin 2 3 ∘ + sin 2 7 ∘ + sin 2 1 1 ∘ + sin 2 1 5 ∘ + sin 2 7 5 ∘ + sin 2 7 9 ∘ + sin 2 8 3 ∘ + sin 2 8 7 ∘ = 4 (Petunjuk: Gunakan sin 2 x + cos 2 x = 1 )

Buktikan identitas trigonometri  

(Petunjuk: Gunakan )

  1.  begin mathsize 14px style horizontal ellipsis end style

  2. begin mathsize 14px style horizontal ellipsis end style 

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N. Putri

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Pembahasan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell sin squared 3 degree plus sin squared 7 degree plus sin squared 11 degree plus sin squared 15 degree plus sin squared 75 degree plus sin squared 79 degree plus sin squared 83 degree plus sin squared 87 degree end cell row blank blank blank row blank equals cell sin squared 3 degree plus sin squared 7 degree plus sin squared 11 degree plus sin squared 15 degree plus sin squared left parenthesis 90 degree minus 3 degree right parenthesis plus sin squared left parenthesis 90 degree minus 7 degree right parenthesis plus sin squared left parenthesis 90 degree minus 11 degree right parenthesis plus sin squared left parenthesis 90 degree minus 15 degree right parenthesis end cell row blank equals cell sin squared 3 degree plus sin squared 7 degree plus sin squared 11 degree plus sin squared 15 degree plus cos squared 3 degree plus cos squared 7 degree plus cos squared 11 degree plus cos squared 15 degree end cell row blank equals cell 4 space. end cell end table end style

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Jawablah pertanyaan-pertanyan di bawah ini dengan benar! Buktikan Identitas trigonometri berikut. 3 cos 2 x = 3 − 3 sin 2 x

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